Apparatus for monitoring phase voltages of a polyphase tachomete

Details Apparatus for monitoring phase voltages of a polyphase tachomete Apparatus for monitoring phase voltages of a polyphase tachomete

1989-04-14

1990-06-26

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324511, 324160, 324546, G01R 3134

Patent

active

049375300

ABSTRACT:
A method and circuit for monitoring phase voltages of a polyphase tachometer generator to detect a phase failure, where the tachometer generator is associated with a rotor position transmitter. The phase voltages are added up by a summing stage to form an auxiliary voltage. The auxiliary voltage is sampled at every commutation instant determined by a rotor position signal generated by the rotor position transmitter during a predetermined measuring time. This sampled voltage value is compared with a predetermined voltage value range. An indication of a tachometer fault is displayed as soon as a sampled voltage value is outside the predetermined voltage value range. By this method and circuit, a fault which occurs between two commutation instants can be detected at the next commutation instant.

REFERENCES:
patent: 3662252 (1972-05-01), Smith
patent: 4086563 (1978-04-01), Bachman
patent: 4229695 (1980-10-01), Bassi
patent: 4377784 (1983-03-01), Saito et al.

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